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Understanding BMI for Adults

Learn what your BMI number means, what category you fall into, and what the WHO guidelines say.

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BMI
22.9
Normal weight
1018.5253040

Healthy weight range for your height: 56.7 – 76.3 kg

BMI Categories (WHO)
UnderweightBelow 18.5
Normal weight18.5 – 24.9
Overweight25.0 – 29.9
Obese (Class I)30.0 – 34.9
Obese (Class II)35.0 – 39.9
Obese (Class III)40.0 and above

BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, or fat distribution. Consult a healthcare professional for personalised advice.

Education tips

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Note: this calculator uses adult BMI categories. Children and teenagers require age- and sex-specific BMI percentile charts (BMI-for-age) β€” consult a paediatrician.

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BMI = weight (kg) Γ· heightΒ² (mΒ²). A 70 kg person who is 1.75 m tall: 70 Γ· (1.75 Γ— 1.75) = 70 Γ· 3.0625 = 22.9 (Normal).

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The WHO defines four categories: Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9), Obese (30+). These are international standards.

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Some health organisations use lower BMI thresholds for Asian populations, where health risks from excess weight appear at lower BMI values.

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